#valac --pkg sdl2 -X `pkgconf.exe --libs sdl2_gfx`  -o sdlsample SDLSample.vala --Xcc=`pkgconf.exe --cflags sdl2_gfx`
valac --pkg sdl --pkg sdl-gfx -X -lSDL_gfx -o sdlsample SDLSample.vala
